Copying mechanism



o. WALDRICH i 1,893,916

COPYING MECHANISM Jan. 10, 1933.

2 sheets-sheet 2 Filed July l. 1931 Patented Jan. 1o, 1933 UNITED STATES A@SKAR WALDRICH, F SIEGEN, GERMANY COPYING MECHANISM Application led Julyl, 1931, Serial No This invention relates to copying mechanism and more particularly to a copying lathe adapted to operate on a polygonal work-piece, for example a four cornered Work-piece.

A The general object of the present invention is to provide a construction of copying lathe of such a nature that the shaping of the cross-sectional contour of a Work-piece is not eifected under the control of a template mounted behind the bed of the machine so as to extend throughout the length of the workpiece' and adapted to move or actuate a tool supporting structure.

In accordance with the present invention the shaping of the work-piece is effected under the control ot a cam which imparts an oscillatory motion to the upper tool supporting slide about a pivot located below the work-piece being operated on.

In the accompanying drawings one constructional form of lathe embodyfng the invention is diagrammatically illustrated by way of example, parts of the lathe not necessary for understanding the invention being omitted from the drawings.

Figure 1 is a side elevation of the mach'ne partly in section.

Figure 2 is a si'de elevation.

Figure 3 is a plan view. A

The bed 1 of the machine supports a bed slide 2 on which an intermediate slide 3 is movably mounted. A support 5 is oscillatably carried by a pivot 4 A rocker 6 is rotatably mounted at the point 7 on the bed slide 2. The free end of the rocker bears on a cam or eccentric 8 secured to a shaft 9.

`When a four cornered Work-piece is to be operated on, the shaft 9 is rotated with the eccentric 8 and this causes an oscillatory' motion to be imparted to the pivotal support 5 g byv means of the rocker 6 and a transversely adjustable member 10. The shaft 9 is rotated at four times the speed of the work- 4 piece so that the cutting tool approaches to and recedes from the axis of the work-piece four times during each rotation of the latter owing to the oscillatory motion of the support 5.

In order that work-pieces having edges of i verse 548,070, and in Germany J'uly 30, 1930.

diiering lengths may be turned the support 5 must be able to execute a greater or smaller stroke as required. For this purpose the member 10 is transversely adjustable by .means of a hand wheel 11 and spindle 12.

vWhen the transversely adjustable'member 10 1s near to its extreme left hand position the stroke ofthe support 5 is a maximum and becomes smaller according as the member 10 approaches the pivot point 7. Whena c'reular work-piece is being operated on in the machine the transversely adjustable member 10 is traversed to the eX- treme right hand position so that the roller 13 carried thereby is no longer in contact with the rocker 6. The oscillatory motion of the support 5 is thus interrupted.

In order that a work-piece may be turned into conical shape a guide bar 14 is suported at the rear ofthe bed. By setting the guide vbar 14 at an inclination corresponding to the inclination or conicity desired in the workpiece theintermediate slide 3 to which an arm 15 is firmly secured is moved backwards and forwards by-means of a slide 16 guided 75 on the bar 14, so that the Work-piece to he turned receives the desired conicity.

.To this end the oscillatory motion of the support 5 must be greater at the thick end of the conically shaped work-piece than at the thinner end thereof. This is effected without difficulty since the intermediate slide 3 supports the adjustable member 10 through the medium of the support 5 so that. the adjustable member participates in all the transdisplacem'ents of the slide 3 and consequently the oscillatory motion is-automati cally reduced as the thickness of the workpiece is diminished.

In order to maintain the same cutting anle of the'cutting tool during turning, the tool holder 18 is oscillatably supported in the upper support 19 movable on the oscillatory support 5.

The oscillatory motion of the tool holder 18 is also derived from the shaft 9. A gear Wheel 2O mounted on the shaft 9 drivesl a gear wheel 21 irmly connected with a crank disc 22. An oscillatory motion is imparted to the tool holder 18 from the crank disc 22 by means of a connecting rod 23, an arm 24:

that the cutting angle of the tool may always c be accurately adjusted.

The transverse displacement of the upper support 19 to suit different thicknesses of the Work-piece is effected by means of a hand Wheel and spindle as is the case with the transversely ad'ustahle member 10i.

By means o the lathe according to the present invention it is possible to produce by means of one and the same cam Work-pieces having lateral surfaces which are either flat, convex 0r concave. By rendering the cam disc inoperative it is further possible to turn a cylindrical Work-piece. t

By varying the number of revolutions of the shaping cam 8 in relation to the number of revolutions of the Work-piece it is possible to operate on a work-piece having any desired number of sides, the shape of the workpiece being determined by the contour of the shaping cam.

I claim:

1. A copying mechanism for turning a tapered polygonal Work-piece, comprising a bed, a cutting tool mounted thereon, means for supporting a Work-piece adjacentto said tool and for rotation on its longitudinal axis, means for reciprocating said tool transversely of the axis of the work-fpiece, means for moving said tool axially o the Work-piece, and means actuated by saidl axial movement of the tool for automatically changing the starting points of i s reciprocating strokes, and means gover by said' last-mentioned means for automatically changing the lengths of said strokes.

2. A copying mechanism for turning a tapered polygonal work-piece, com 'rising a bed, a slide mounted on the bed or longitudinal movement, a support disposed on the slide for transverse movement, a cutting tool mounted on the support,means for supp0rting a Work-piece adjacent to said tool and for rotation on its longitudinal axis, means for oscillating said support to cause said tool to reciprocate transversely of the axis of the Work-piece, means for moving said slide axially of the Work-piece, means actuated by said axial movement of the slide for moving said support transversely thereof to automatically change the starting points of the reciprocating strokes of said tool, and means associated with said support and oscillating. means and governed by said last-mentioned means for automatically changing the lengths of said strokes.

3. A copying mechanism for turning a tapered polygonal work-piece, comprising a bed, a slide mounted on the bed for longitudinal movement, a support disposed on the slide for transverse movement, a cutting tool mounted on the su port, means for supporting a Work-piece a jacent to said tool and for rotation on its longitudinal axis n lever pivoted to said bed and operatively engaging said su port, means actuating said lever for oscillating said support to cause said tool to reciprocate transversely of the axis of the work-piece, means for moving said slide axially of the Work-piece, a guide bar mounted at the/side of said bed in adjustable angular position, and means slidably secured to said ar and connected to said support for moving the support transversely of said slide in accordance with the angular position of said bar as the slide moves longitudinally of the bed, said transverse movement of the support shifting the levera e between it and said oscillating means, w ereb the len hs of the reciprocating strokes o said too are automatically changed simultaneously with said transverse movement of the support.

In testimony whereof I alx my signature.

OSKAR WALDRICH. 

